Various cleanup in soong_ui to aid new feature

- Rename the "BuildX" variables to "RunX"
- Remove redundant comments
- Inline all the "what to do" based on config in build.go
- Inline some constants only used in one place

Bug: 189187214
Test: m nothing
Test: build/soong/build_test.bash
Change-Id: I111a69e642212d7938d4971283545e0d9acbb01a
Merged-In: I111a69e642212d7938d4971283545e0d9acbb01a
(cherry picked from commit d274ea9196)

cmd/soong_ui/main.go

@@ -59,12 +59,10 @@ type command struct {
 	run func(ctx build.Context, config build.Config, args []string, logsDir string)
 }
 
-const makeModeFlagName = "--make-mode"
-
 // list of supported commands (flags) supported by soong ui
 var commands []command = []command{
 	{
-		flag:        makeModeFlagName,
+		flag:        "--make-mode",
 		description: "build the modules by the target name (i.e. soong_docs)",
 		config: func(ctx build.Context, args ...string) build.Config {
 			return build.NewConfig(ctx, args...)
@@ -506,15 +504,7 @@ func runMake(ctx build.Context, config build.Config, _ []string, logsDir string)
 		ctx.Fatal("done")
 	}
 
-	toBuild := build.BuildAll
-	if config.UseBazel() {
-		toBuild = build.BuildAllWithBazel
-	}
-
-	if config.Checkbuild() {
-		toBuild |= build.RunBuildTests
-	}
-	build.Build(ctx, config, toBuild)
+	build.Build(ctx, config)
 }
 
 // getCommand finds the appropriate command based on args[1] flag. args[0]